content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.Scheduler;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.SequentialDisposable;
  import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
  
  /**
   * Subscribe to the source Nono on a specified scheduler.
   */
  final class NonoSubscribeOn extends Nono {
  
      final Nono source;
  
      final Scheduler scheduler;
  
      NonoSubscribeOn(Nono source, Scheduler scheduler) {
          this.source = source;
          this.scheduler = scheduler;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super Void> s) {
          SubscribeOnSubscriber parent = new SubscribeOnSubscriber(s, source);
          s.onSubscribe(parent);
  
          parent.setTask(scheduler.scheduleDirect(parent));
      }
  
      static final class SubscribeOnSubscriber extends BasicRefQueueSubscription<Void, Subscription>
      implements Subscriber<Void>, Runnable {
  
          private static final long serialVersionUID = -6761773996344047676L;
  
          final Subscriber<? super Void> downstream;
  
          final SequentialDisposable task;
  
          final Nono source;
  
          SubscribeOnSubscriber(Subscriber<? super Void> downstream, Nono source) {
              this.downstream = downstream;
              this.source = source;
              this.task = new SequentialDisposable();
          }
  
          void setTask(Disposable d) {
              task.replace(d);
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              SubscriptionHelper.setOnce(this, s);
          }
  
          @Override
          public void onNext(Void t) {
              // not present
          }
  
          @Override
          public void onError(Throwable t) {
              downstream.onError(t);
          }
  
          @Override
          public void onComplete() {
              downstream.onComplete();
          }
  
          @Override
          public int requestFusion(int mode) {
              return mode & ASYNC;
          }
  
          @Override
          public Void poll() throws Exception {
              return null;
          }
  
          @Override
          public boolean isEmpty() {
              return true;
          }
  
          @Override
          public void clear() {
              // no-op
          }
  
          @Override
          public void request(long n) {
              // no-op
          }
  
          @Override
          public void cancel() {
              SubscriptionHelper.cancel(this);
              task.dispose();
          }
  
          @Override
          public void run() {
              source.subscribe(this);
          }
      }
  }
  